The JOF is a benign fibro-osseous lesion that affects the craniofacial skeleton, specially the periorbital, frontal and ethmoid bones. The mandible is affected by only 10% of the cases. They occur most often in patients under 15 years old. Clinically it is presented as a fast growth, painless and locally aggressive lesion that can reach a large size.

The recommended treatment of the JOF is the surgical excision, with a 5 mm margin, and the complete excision of the lesion is curative.

Recurrence rates for JOF vary, with reports as high as 30 to 58%. Malignant transformation has not been reported.

We present a case of a mandibular JOF in a 9-year-old child which extended from the mandibular left body to the mandibular ramus, affecting the left condile and coronid process. The tumor resection, with a security margin was designed, and the inmediate mandibular reconstruction through an iliac crest and costochondral grafts for the respective mandibular body and condile was performed. The alveolar nerve was conserved.

The patient has been under control for 2 years with no recurrence noted, associated to a successful aesthetic and functional mandibular reconstruction.

Conflict of interest: None declared.